Configurable Header Logs for PCIe and CXL Error Debugging
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Solution Overview
Problem
Conventional error management systems in PCIe and CXL protocols face challenges in debugging and handling errors due to limitations in header log implementations, particularly in capturing full address information for completion headers and lacking sufficient data for correctable errors.
Innovation Solution
The implementation of extended error management with configurable header logs using memory-mapped log registers to record request and completion transactions for both PCIe and CXL protocols, providing detailed header log information for correctable and uncorrectable errors, and incorporating an informative miscellaneous status register for error severity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional header log implementations are used in PCIe and CXL protocols, then the error management system maintains simplicity and basic functionality, but the system cannot capture full address information for completion headers and lacks sufficient data for correctable errors
Solution Approach 1:
The error management system is segmented into separate functional components: a header log unit that captures transaction headers, a status register unit that tracks error conditions, and a configuration register unit that controls logging behavior. This segmentation allows comprehensive information capture without requiring a monolithic complex system, as each unit handles specific aspects of error management independently
Solution Approach 2:
The header log implementation uses a nested structure where transaction header information is captured within the error management framework. The header log unit stores complete address information and transaction details within the existing error management registers, creating a nested information hierarchy that expands data capture capability without proportionally increasing external system complexity
2Ease of operation
If extended error management with configurable header logs is implemented, then comprehensive header log information is provided for debugging and error handling, but the device complexity increases due to additional registers and logging functionality
Solution Approach 1:
The header log unit is designed with multi-functionality, serving both PCIe and CXL protocols simultaneously. The same logging mechanism captures different types of transactions (request and completion headers) and supports multiple error severity levels (correctable and uncorrectable errors). This universal approach provides comprehensive debugging capability without requiring separate dedicated logging systems for each protocol
Solution Approach 2:
The system incorporates dynamic configurability through configuration registers that allow software to enable or disable specific logging functions based on needs. The header log unit can dynamically adjust what information is captured based on protocol requirements and error conditions, providing flexible debugging capability while avoiding unnecessary complexity when full logging is not required
3Reliability
If complete transaction information is logged for all error types, then software can take effective corrective actions and identify error sources, but the amount of data stored increases requiring additional memory resources
Solution Approach 1:
The logging system applies local quality by capturing complete transaction information selectively based on error severity and type. Critical errors (uncorrectable errors, correctable errors with poison data) trigger comprehensive header logging with full address information, while less severe conditions may use simplified logging. This localized approach ensures reliable error handling for critical issues while reducing overall data storage requirements
Data Source
AI summary
An example of an apparatus may include a processor to process request transactions and completion transactions for one or more respective communication protocols, memory coupled to the processor to store error-related transaction information, and circuitry coupled to the memory to save the error-related transaction information in the memory for both the request transactions and the completion transactions for the one or more respective communication protocols. Other examples are disclosed and claimed.